Status of the heavy ion beam probe system in the Large Helical Device | Zendy

M. Nishiura | Zendy; T. Ido | Zendy; A. Shimizu | Zendy; Hiroyuki Nakano | Zendy; Tomokazu Kato | Zendy; Susumu Katō | Zendy; Y. Hamada | Zendy; V.P. Shevelko | Zendy; R.K. Janev | Zendy; M. Wada | Zendy

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Status of the heavy ion beam probe system in the Large Helical Device

Author(s) -

M. Nishiura,

T. Ido,

A. Shimizu,

Hiroyuki Nakano,

Tomokazu Kato,

Susumu Katō,

Y. Hamada,

V.P. Shevelko,

R.K. Janev,

M. Wada

Publication year - 2008

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.2819323

Subject(s) - physics , large helical device , beam (structure) , atomic physics , ion , ion gun , ion beam , ion beam deposition , plasma , ion source , range (aeronautics) , injector , plasma diagnostics , nuclear physics , optics , materials science , quantum mechanics , composite material , thermodynamics

A heavy ion beam probe (HIBP) system has been installed into the Large Helical Device (LHD) to measure the spatial profile of the plasma potential and density fluctuations. The optimization of the HIBP system, especially the beam injector, is described. The negative ion beam is required for the MeV beam production in a tandem accelerator. A sputter-type heavy negative ion source has been developed as an intense Au^? beam source to produce Au^+ beams with energy in the MeV range. The extraction electrodes and the Einzel lens system of the ion source have been designed taking into account the beam optics, and installed into the real machine. Throughout the plasma diagnostics on LHD experiments, the consumptions of vaporized caesium and gold target are being characterized for practical operations. In addition, the experimental charge fractions are compared with the theoretical fractions for understanding the charge-changing behavior of Au^? ions and optimizing the fraction of Au^+ ions at the exit of the tandem accelerator of the HIBP syste

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